WO1997007880A1 - Dispositif pour retirer une matiere en vrac contenue dans un recipient sous pression - Google Patents

Dispositif pour retirer une matiere en vrac contenue dans un recipient sous pression Download PDF

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Publication number
WO1997007880A1
WO1997007880A1 PCT/EP1996/003311 EP9603311W WO9707880A1 WO 1997007880 A1 WO1997007880 A1 WO 1997007880A1 EP 9603311 W EP9603311 W EP 9603311W WO 9707880 A1 WO9707880 A1 WO 9707880A1
Authority
WO
WIPO (PCT)
Prior art keywords
lock
sealing
bulk material
plate
bunker
Prior art date
Application number
PCT/EP1996/003311
Other languages
German (de)
English (en)
Inventor
Emile Lonardi
Romain Frieden
Jörg BRINCKMANN
Patrick Hutmacher
Original Assignee
Paul Wurth S.A.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Paul Wurth S.A. filed Critical Paul Wurth S.A.
Priority to BR9610019A priority Critical patent/BR9610019A/pt
Priority to EP96928384A priority patent/EP0861118A1/fr
Priority to AU67876/96A priority patent/AU701189B2/en
Publication of WO1997007880A1 publication Critical patent/WO1997007880A1/fr

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65G—TRANSPORT OR STORAGE DEVICES, e.g. CONVEYORS FOR LOADING OR TIPPING, SHOP CONVEYOR SYSTEMS OR PNEUMATIC TUBE CONVEYORS
    • B65G53/00—Conveying materials in bulk through troughs, pipes or tubes by floating the materials or by flow of gas, liquid or foam
    • B65G53/34—Details
    • B65G53/40—Feeding or discharging devices
    • B65G53/46—Gates or sluices, e.g. rotary wheels
    • B65G53/4691—Gates or sluices, e.g. rotary wheels of air-lock type, i.e. at least two valves opening asynchronously
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D33/00—Filters with filtering elements which move during the filtering operation
    • B01D33/15—Filters with filtering elements which move during the filtering operation with rotary plane filtering surfaces
    • B01D33/21—Filters with filtering elements which move during the filtering operation with rotary plane filtering surfaces with hollow filtering discs transversely mounted on a hollow rotary shaft
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D33/00—Filters with filtering elements which move during the filtering operation
    • B01D33/70—Filters with filtering elements which move during the filtering operation having feed or discharge devices
    • B01D33/76—Filters with filtering elements which move during the filtering operation having feed or discharge devices for discharging the filter cake, e.g. chutes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D33/00—Filters with filtering elements which move during the filtering operation
    • B01D33/70—Filters with filtering elements which move during the filtering operation having feed or discharge devices
    • B01D33/76—Filters with filtering elements which move during the filtering operation having feed or discharge devices for discharging the filter cake, e.g. chutes
    • B01D33/766—Devices for breaking the filter cake, e.g. cutting
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J3/00—Processes of utilising sub-atmospheric or super-atmospheric pressure to effect chemical or physical change of matter; Apparatus therefor
    • B01J3/02—Feed or outlet devices therefor

Definitions

  • the present invention relates to a device for discharging bulk material from a pressure vessel, which comprises at least one lock bunker with a lower and an upper lock gate.
  • Such a device is used, for example, in pressure filtration.
  • the dried solid is obtained in bulk in a pressure vessel in which there is an overpressure of a few bar compared to the ambient pressure.
  • This generally continuous bulk material must then be discharged from the pressure vessel without the actual filtration process being adversely affected.
  • lock systems are generally used with two lock bunkers arranged one below the other, the lock bunkers being gas-tightly closable at their lower ends by means of a lock gate. Process pressure initially prevails in the two lock bunkers, the upper lock gate being open while the lower lock gate being gas-tight.
  • the bulk material to be discharged is conveyed into the lower lock bunker until its maximum fill level is reached.
  • the upper lock gate is closed in a gas-tight manner, so that a pressure equalization with the surroundings can be carried out in the lower lock bunker while there is still process pressure in the upper lock bunker.
  • the lower lock gate After emptying the lower lock bunker by opening the lower lock gate, it is closed again and the lock bunker is brought to process pressure again.
  • the upper lock gate is opened and a new lock cycle can begin.
  • Rotary flaps are used as lock gates, for example.
  • a rotary flap comprises a sealing disk which is rotatable about an axis, the axis running diametrically through the sealing disk and being arranged horizontally in the lower open ends of the respective lock bunker.
  • the sealing disc takes a horizontal right position, with a seal running radially around the sealing washer sealingly against the inner wall of the lock bunker.
  • the sealing disk is rotated about its axis of rotation into a vertical position, a first of the two halves of the sealing disk protruding upward into the respective lock bunker, while the second half protrudes downward from the lock bunker.
  • the first half of the sealing washer must be moved against the bulk material lying on the sealing washer. On the one hand, this requires a very high drive power to open the sealing flap, on the other hand, this results in high wear of the seal in this area. If the upper rotary flap is open, the second half of its sealing washer also projects down into the lower lock bunker. This reduces the maximum fill level of the lower lock bunker by the amount of the radius of the sealing washer. A dead volume thus arises in the upper area of the lock bunker, which must be ventilated or pressurized with each pressure equalization, but which is not available for the discharge of bulk material.
  • flat slides can be used for the lock gates.
  • These flat slides comprise a horizontal closure plate arranged in a housing, which is horizontally displaceable in the housing between a first closed position, in which the closure plate closes a passage channel for the bulk material arranged perpendicular to the displacement plane, and a second, open position in which the passage channel is released.
  • the closure plate interacts with an overlying seal which is attached in the housing around the passage channel.
  • the closure plate is generally mounted on support rollers which surround the passage channel in the Housing are arranged.
  • the object of the present invention is therefore to propose a device for discharging bulk material from a pressure vessel, which is characterized by a positive self-locking sealing function.
  • a device for discharging bulk material from a pressure vessel which comprises at least one lock bunker with a lower and an upper lock gate, and which is further characterized in that at least one lock bunker is arranged below a plate into which it opens trained for the bulk material, and that the upper lock gate has a sealing member, preferably a sealing washer which is arranged above this plate so that it can be positioned over the mouth of the lock bunker and after sealing connection to the edge of the mouth by an overpressure in the pressure vessel this border can be pressed.
  • the entire volume of the lock bunker can also be used as the useful volume.
  • the sealing washer always lies above the mouth of the lock bunker. For this reason, practically the entire height of the lock bunker can be used as a filling height, and the entire volume of the lock bunker is available as a useful volume.
  • a first and a second lock bunker are arranged below the plate into which they form a first and a second junction for the bulk material.
  • the sealing washer is arranged above the plate in such a way that it can be positioned both over the first and the second junction and after sealing connection to the border of the respective junction can be pressed against this border by an overpressure in the pressure vessel.
  • This tandem version enables alternate filling of one of the two lock bunkers, while the other lock bunker can be sealed at the top by the sealing washer, brought to ambient pressure and emptied.
  • the arrangement of the two lock bunkers next to each other in contrast to the conventional arrangement with lock bunkers arranged one below the other, results in an extremely low overall height of the lock arrangement.
  • the height of a pressure filtration system is an important cost factor depending on the location.
  • the capacity of the device can be increased by extending the lock bunker.
  • such an increase in capacity in a conventional lock system can generally only be achieved by increasing the diameter of the lock bunker and thus also the throughput. knife of the lock gates can be reached.
  • Such an increase in the diameter of the lock gates causes an increase in the forces which act on the lock gates due to the differential pressure. If the lock gates do not have a positive sealing function, this can lead to a loss of the sealing function and the associated consequences.
  • the described embodiment of the device comprises only one sealing disk, which can alternately seal the mouth of the first lock bunker and the mouth of the second lock bunker.
  • a positive self-locking sealing function is provided regardless of the sealed lock bunker.
  • the device is designed in such a way that the plate is circular and completely flat, that the openings for the bulk material are arranged eccentrically and are formed flush with the surface of the plate, that the sealing disk can be rotated around the center of the plate, and that a wiper is mounted on the sealing washer in such a way that it completely wipes the plate when the sealing washer rotates 360 °.
  • the sealing disc interacts with the plate to seal a lock bunker, it is very important that the plate is not contaminated by bulk material. If bulk material gets between the plate and the sealing washer, it does not lie smoothly against the plate in the area of the contamination and the sealing function of the lock gate is not guaranteed.
  • the scraper which is attached to the sealing disc, for example, now wipes the positioning of the sealing disc over an opening over this area of the plate and removes any bulk material that is on the plate. The border of the mouth on which the sealing washer subsequently sits is thus cleaned of impurities and a sealing connection of the sealing washer to the plate is ensured.
  • the sealing washer can preferably be moved perpendicular to the plate by means of a hydraulic cylinder. Before a first junction is released, the sealing disc can then be raised by means of the hydraulic cylinder to such an extent that there is no longer any contact between the sealing disc and the plate. The sealing washer can now be swung around and positioned over the second junction without the sealing washer and the plate rubbing against one another. On the one hand, this increases the lifespan of the plate and the sealing washer with a seal possibly arranged below it, on the other hand the drive for rotating the sealing washer can be dimensioned significantly smaller.
  • the sealing disk can be assigned an elastic element such that, when the pressure between the pressure container and lock bunker is equalized, it lifts the sealing disk from the plate.
  • the sealing disk advantageously has an inflatable seal which seals the gap between the sealing disk and the plate inflated seal.
  • the device comprises a discharge opening for the bulk material axially above each mouth of a lock bunker, and a retaining device for the bulk material associated with this discharge opening.
  • a pouring opening limits the bulk material flow in its lateral extent in such a way that all bulk material that falls through the opened pouring opening enters the mouth. This reliably prevents bulk goods from falling onto the plate.
  • the bulk material can also be retained in the pouring opening by the retaining device, so that the sealing disk can be positioned over the opening below it, without bulk material falling onto it. This results in a separation of the material holding function and the sealing function, which additionally prevents contamination of the sealing surfaces.
  • the weight of the bulk goods retained does not rest on the sealing be on the restraint. When the sealing washer is lifted off the plate, only its own weight has to be lifted, so that a hydraulic cylinder or an elastic element for lifting can be dimensioned accordingly weak. Again, this is of some interest in terms of height.
  • the retaining device for the bulk material can, for example, have a closure plate which can be positioned together with the sealing disk and is arranged and designed in such a way that it closes the pouring opening when the sealing disk is arranged over the corresponding mouth.
  • the closure plate and the sealing washer are preferably carried by a common rotating arm. This configuration saves an additional drive for the retaining device and it is ensured that when the sealing disk is pivoted over a junction, the retaining device interrupts the flow of bulk material at the same time.
  • the sealing plate preferably protrudes in the direction of rotation over the sealing washer and has a central indentation. When swiveling into a bulk material flow, this is first interrupted by the protruding area of the sealing plate before the sealing disk gets under the pouring opening.
  • a further preferred embodiment of the device according to the invention comprises a continuous conveyor in the pressure vessel, which has two spaced discharge openings at its conveying end, the first discharge opening having a retaining device for the bulk material.
  • This Design allows an advantageous diversion of the bulk material flow from one lock bunker to the other. If the first discharge opening is open, the material brought in by the continuous conveyor falls through this discharge opening into the first lock bunker. Once its maximum fill level has been reached, the retaining device closes the first discharge opening and the first lock bunker can be tightly closed and then emptied. In the meantime, the first, now closed discharge opening is completely filled with bulk material. Thereafter, the bulk material that continues to be conveyed by the continuous conveyor is moved over the first discharge opening and reaches the second lock bunker through the second, opened discharge opening.
  • the sealing disk first swivels into a position in which the two lock bunkers are open at the top, then the retaining device opens and opens the first discharge opening again.
  • the newly brought bulk goods fall again into the first lock bunker, while the bulk goods which are located between the two discharge openings on the continuous conveyor are transported into the second lock bunker which is still open. Only then is the second lock bunker sealed and then emptied.
  • the retaining device for the bulk material can, for example, have two cylindrical striking plates which overlap in the closed position. These overlapping striking plates can additionally have corresponding cutouts which cooperate when the striking plates are moved apart to release an opening centered on the axis of the junction below.
  • a pressure chamber is preferably formed below the plate with the openings for the pressure locks through a dished bottom, which is connected in terms of pressure to the pressure vessel.
  • the lower lock gate of the device advantageously has a sealing cap, the concave curvature of which is assigned to the lock bunker. This sealing cap is pivoted away to the side to open the lower lock gate, the axis of rotation of the pivoting movement running horizontally and through the center of the cap curvature.
  • the lock gate cannot open automatically even if all media supplies fail, since the sealing cap is held in its closed position by gravity. Furthermore, the concave curvature oriented towards the lock bunker in the closed state of the lower lock gate additionally increases the useful volume of the lock bunker.
  • the lower lock gate advantageously has a sealing seat with an inflatable sealing ring.
  • a pressure medium is applied to the sealing ring via a channel, so that the sealing ring lies firmly against the inner surface of the sealing cap. If the lower lock gate is to be opened, the pressurization of the sealing ring is adjusted in order to reduce the friction with the sealing spherical cap and thus increase the service life of the sealing ring.
  • the inflatable sealing ring can be associated with an annular scraper which is associated with the spring means in such a way that it is pressed against the inner curvature of the sealing cap.
  • this scraper scrapes bulk material from the sealing surface of the sealing cap and thus prevents it from getting under the sealing ring and impairing the sealing function.
  • an annular gap is furthermore arranged between the inflatable sealing ring and the annular scraper, which can be connected to a purge gas supply, the gap between the sealing surface and the sealing ring can additionally be e.g. be cleaned with compressed air.
  • the ring-shaped scraper can be clamped in the sealing seat by means of a resilient disc and can be supported axially on the sealing seat, for example, via an elastomer ring.
  • Fig. 1 a longitudinal section through a system for pressure filtration with a bulk material lock according to the invention in tandem design;
  • Fig. 2 a cross section along the line A-A through the system of Fig. 1;
  • Fig. 3 a partially cut lock bunker with lock gates and
  • FIG. 4 an enlarged section from FIG. 2, which represents the upper part of the bulk material lock
  • 5 an enlarged detail from FIG. 3
  • 11 a bulk goods flap for an alternative embodiment of the bulk goods lock according to the invention
  • 12 a functional diagram of an alternative embodiment of the bulk goods lock according to the invention with bulk goods flap
  • 13 a third embodiment variant of the bulk material lock according to the invention.
  • a pressure filtration system for separating solid-liquid mixtures or suspensions by means of disc filters is shown schematically.
  • Such a system comprises an essentially cylindrical pressure vessel 2, in which there is an overpressure of up to 8 bar compared to the external pressure.
  • a suspension vessel 4 Arranged within this pressure vessel 2 is a suspension vessel 4 (see FIG. 2), which has the shape of a se has halved cylinder and contains the solid-liquid mixture to be filtered.
  • a plurality of filter disks 6 arranged one behind the other, which are mounted on a rotating filter shaft 8, are immersed in this suspension container 4. In its lower area, the filter disks 6 are consequently in contact with the suspension.
  • the pressure vessel 2 has, at its rear end, seen in the conveying direction 15 of the bulk material conveyor 12, below the bulk material conveyor 14, a cylindrical connecting piece 16 with a flange 18 which is open at the bottom.
  • a dished bottom 20 is flanged to this flange 18, into which a plate 22 is welded.
  • Two substantially cylindrical lock bunkers 24 and 26 are mounted vertically in the dished bottom 20 and each have an opening 28, or 30 in the plate 22. The lower end of each lock bunker 24 and 26 protrudes from the dished end 20 and forms a discharge opening 32 or 34 for the bulk material from the lock.
  • the two lock bunkers 24 and 26 are arranged in such a way that the orifices 28 and 30, respectively, exactly below the discharge opening of a chute 36 and 38 of the rubble Gutumbleers 12 lie.
  • the chutes 36 and 38 are arranged one behind the other and below the conveyor end of the bulk material conveyor 12, a vertical gap remaining between the lower edge of each chute 36 and 38 and the mouth 28 or 30 of the respective lock bunker 24 or 26. Through the chutes 36, 38, the dried bulk material can fall vertically down into the respective lock bunker 24, 26 below.
  • an upper lock gate 40 is arranged, which alternately closes one of the two openings 28, 30 of the lock bunkers 24, 26 in a gas-tight manner.
  • a pressure equalization with the surroundings can then be established in the sealed lock bunker 24 or 26 before a lower lock gate 42 or 44 of the lock bunker 24 or 26 is subsequently opened in order to empty the lock bunker.
  • the lower lock gates 42, 44 advantageously comprise a sealing cap 46 or 48, the concave curvature of which faces the lock bunker 24 or 26 and which, in the closed state, interacts with a sealing seat 49 at the lower end of the respective lock bunker 24, 26 in order to lock the lock to close the bunker gas-tight at its lower end.
  • the sealing cap 46, 48 is pivoted away upwards to the side.
  • each sealing cap 46, 48 with two diametrically opposed rotating arms 50 is mounted on two rotating joints 52 mounted on the outside of the lock bunker 24 or 26 in such a way that the (imaginary) axis of rotation 54 of the rotating arms 52 runs horizontally the center of the dome curvature leads.
  • the joints 52 are advantageously additionally supported at their outermost end by support struts 56, the upper end of which is fixed to the dished bottom 20.
  • 3 shows the drive and the mode of operation of the lower lock gates 42, 44.
  • Both the rotary arms 50 and the support struts 56 instruct at their respective lower ends a flange 58 or 60 directed against the opening direction of the sealing cap 46.
  • a hydraulic cylinder 62 is mounted essentially parallel to the rotating arm 50.
  • the piston of the cylinder 62 is directly rotatably supported on the flange 58, while the housing of the cylinder 62 is rotatably supported on a spacer arm 64 which is fixed to the flange 60.
  • This arrangement of the hydraulic cylinder 62 when it is actuated, causes the sealing cap 46 to rotate about the axis of rotation 54.
  • the dome 46 is shown in a lateral position in FIG. 3 with broken lines, in which it completely clears the discharge opening of the lock bunker 24.
  • the upper sealing device is shown in FIGS. 4 and 5 (in sections). It comprises a sealing washer 66 which is mounted on a vertical axis of rotation 70 by means of a rotating arm 68. This axis of rotation 70 is perpendicular to the horizontal plate 22, so that the sealing washer 66 can be rotated in a plane parallel to the plate.
  • the diameter of the sealing washer 66 is larger than the diameter of the orifices 28 and 30 of the lock bunkers 24 and 26 in the plate 22, so that the sealing washer 66 can completely cover these orifices 28, 30 if it is located directly above it.
  • the sealing disk 66 On its underside, the sealing disk 66 has a radially circumferential seal 72 on its outer edge, which is arranged in a sealing seat 74 in the sealing disk 66 (see also FIG. 5).
  • the seal 72 advantageously cooperates with a wear-resistant, exchangeable plate 76 which covers the plate 22 over its entire surface, with recesses for the mouths 28 and 30 of the lock bunkers 24, 26 naturally being provided in the plate 76 are.
  • This interchangeable plate 76 has a smooth surface as a rotating surface and seating surface for the bulk material.
  • the axis of rotation 70 is set in rotation. This rotation always takes place in the same direction, so that the sealing disk 66 swivels through 360 ° during a lock cycle.
  • the axis of rotation 70 is preferably arranged so that it runs through the center of the dished bottom 20, the upper end above the circular Plate 76 ends and the lower end is led gas-tight downwards out of the dome bottom 20 by means of a passage 78.
  • This has the advantage that a drive motor 80 and a reduction gear with position transmitter 82 (see FIG. 3) for driving the axis of rotation 70 are located outside the pressure container and are therefore easily accessible.
  • the sealing disk 66 can be lifted off the plate for pivoting around, that is to say it can be moved perpendicular to the plate 76.
  • a hydraulic cylinder 84 is arranged between the rotating arm 68 and the sealing disk 66.
  • This hydraulic cylinder 84 enables a vertical adjustment of the sealing washer 66 between a raised position in which there is no longer any contact between the seal 72 in the sealing washer 66 and the plate 76, and a lowered sealing position in which the seal 72 in the sealing washer 66 seals the plate 76 abuts. 4, the sealing washer is in its raised position above the lock bunker 24. The sealing washer 66 can now be pivoted directly over the mouth 30 of the lock bunker 26 and brought there into its lowered position. This is indicated by dashed lines in FIG. 4.
  • the supply of hydraulic fluid to act on the cylinder 84 takes place through a channel (not shown) which runs through the axis of rotation 70 and the rotary arm 68 and which is connected to supply lines 88 via a rotary leadthrough 86 (see FIG. 3).
  • the upper lock gate has a positive, self-locking sealing function in the sealing position, that is to say that an overpressure in the pressure container presses the sealing disk against the plate so that the upper lock gate remains sealed even if the hydraulic cylinder 84 fails .
  • a ball or universal joint (not shown) allows the axis of the sealing washer to tilt slightly relative to the vertical. This ensures that the sealing is precisely aligned when changing to the lowered position. disc 66 on the plate 76 so that the seal 72 rests on the entire circumference of the plate 76.
  • the sealing disk can also be connected to the rotary arm by simple spring means (85) in such a way that these spring means cause the sealing disk to be lifted off the plate easily.
  • This alternative device for lifting the sealing plate 66 is shown in FIG. 6.
  • the sealing disk 66 advantageously has an inflatable seal 73, which seals the gap between the sealing disk 66 and the plate 76 in the inflated state. After sealing one of the orifices 28, 30 by inflating the hose seal, when the corresponding lock bunker 24, 26 is relieved of pressure, the sealing washer 66 is pressed firmly against the plate 76 by the overpressure in the pressure vessel, so that the upper lock gate 40 also has one in this embodiment has positive self-sealing function.
  • a closure plate 90 is attached above the rotating arm 68 in such a way that, when the sealing disk 66 is pivoted about via an orifice 28 or 30, it slides exactly under the discharge opening of the corresponding drop chute 36 or 38 and closes it for the bulk material.
  • This closure plate is designed in such a way that it completely covers the sealing disk 66 and projects beyond it in its front region (in the pivoting direction). If the upper lock gate 40 is consequently pivoted into a bulk material stream falling out of a chute 36 or 38, the closure plate 90 cuts off the bulk material stream directly below the discharge opening of the corresponding chute 36 or 38. Here, the bulk material falls on the closure plate 90 and not on the sealing disk 66 lying behind it.
  • the space between the sealing disk 66 and the closure plate 90 is additionally closed off with a bellows 92.
  • 7 shows a top view of the pivoting of the sealing washer into a bulk material stream falling from a chute 36 in four sub-steps a) to d).
  • the plate 76 can be seen with the circular openings 28 and 30 of the two lock bunkers 24 and 26 located therein.
  • the square cross sections of the chutes 36 and 38 are somewhat smaller than a square inscribed in the openings.
  • the closure plate 90 In the rear area (seen in the pivoting direction), the closure plate 90 is designed essentially the same as the sealing disk 66. In the front area (viewed in the pivoting direction), however, the closure plate 90 is larger than the underlying sealing disk 66, so that the closure plate 90 behind protrudes at the front.
  • the front edge of the closure plate 90 is designed in such a way that when the plate 90 is swung in under a chute 36, 38, the corners of the chute 36, 38 are covered in a favorable manner. This is important since the corners of the discharge chutes 36, 38 come closest to the boundaries of the openings 28, 30, and therefore the risk of bulk material application to the plate 76 is greatest here.
  • the closure plate 90 In order to cover the corners of the chutes 36, 38 closest to the axis of rotation 70 as quickly as possible (FIG. 7, c), the closure plate 90 therefore has a protruding extension in an inner region.
  • the outer area of the closure plate is shaped such that the last edge of the chute 36, 38 to be covered is covered first in the area of the last outer corner and only last in its central area, where the horizontal distance between this edge of the chute 36, 38 and the boundaries of the mouth 28, 30 is greatest (Fig. 7, d).
  • the closure plate 90 has an indentation in its central region.
  • the special shape of the closure plate 90 largely prevents bulk material from falling out of the chute 36, 38 onto the plate 76. Such contamination of the plate 76 can impair a level placement of the seal 72 and thus endanger the sealing function of the upper lock gate 40. Should bulk material nevertheless get onto the plate 76, it must if possible, remove it from the plate.
  • a wiper 94 is mounted below the closure plate 90 in the region of its front edge, which wipes over the plate 76 during the 360 ° rotary movement and pushes the bulk material that may be present in front of it.
  • the scraper 94 extends from the axis of rotation 70 to the edge of the circular plate 76, so that the plate 76 is cleaned immediately before the sealing disk 66 is put on.
  • the scraper 94 is designed in such a way that the bulk material pushed in front of it falls into an orifice 28, 30 when it subsequently slips over it.
  • the stripper 94 preferably has a kink in its center, the tip of which points against the pivoting direction.
  • any bulk material present on the plate 76 is carried along by the stripper 94, and due to the inclination of the two stripper halves relative to a radial line, it is conveyed into the throat of the kink. Due to the kink shape of the rotatable scraper 94, the stripped bulk material is essentially concentrated in a circular path that leads through the centers of the two openings 28 and 30. All bulk material falling on the plate 76 is therefore reliably pushed into a lock bunker 24, 26.
  • FIG. 8 shows the mode of operation of the bulk goods lock described above, the position of the closure plate with the sealing disk 90 underneath being shown in each case in a lower part.
  • the front lock bunker 24 is being filled with bulk material 96.
  • the lower lock gate 42 is closed and the junction 28 is released. Consequently, the excess pressure prevailing in the pressure vessel 2 prevails in the front lock bunker 24.
  • the bulk material 96 is brought up by the bulk material conveyor 12 and falls through the outlet shaft 36 into the mouth 28 of the lock bunker 24. Simultaneously with the filling of the front lock bunker 24, the rear lock bunker 26 filled in a previous step is emptied.
  • the sealing disk 66 closes the mouth 30 (see lower image), and in the lock bunker 26 pressure equalization with the surroundings is established. Once this pressure equalization has taken place, the lower lock gate 44 can be opened and the lock bunker 26 empties. After the lock bunker 26 is completely emptied, the lower lock gate 44 is closed again and a pressure compensation between the pressure vessel 2 and the lock bunker 26 is established. In the meantime, the lock bunker 24 is filled and must be emptied. The sealing disk 66 is lifted from the mouth 30 and the upper lock gate 40 can be pivoted around the mouth 28 of the lock bunker 24.
  • the lock bunker 24 is again capable of receiving. If the lock bunker 26 now reaches its filling limit, the closure plate 90 with the sealing washer 66 is brought into a position which releases both openings 28 and 30 ( Figure c). The bulk material that had previously accumulated in the chute 36 falls into the lock bunker 24 and the chute 36 is released again. The bulk material 96 brought in by the bulk material conveyor 12 can now fall back into the lock bunker 24. However, there is still bulk material on the bulk material conveyor 12 between the two chutes 36 and 38, which was conveyed over the chute 36 before it opened, but has not yet reached the lock bunker 30.
  • FIG. 9 shows a first embodiment variant of the sealing seat 49 of a lower lock gate 42. Since such a sealing seat 49 comprises wear parts, it is advantageously mounted on the lock bunker 24 in such a way that it can be easily replaced.
  • the lock bunker 24 has at its lower end a flange 98 to which an upper flange plate 100 of the sealing seat 49 is flanged.
  • the sealing seat 49 further comprises an inflatable seal 102, which interacts downwards with the preferably hardened inner surface of the sealing cap 46 and an annular bulk material wiper 104, which is seen radially outwards, is arranged in front of the seal 102 and which opens and closes the sealing cap 46 cleans the sealing surface before it comes into contact with the seal 102.
  • the inflatable seal 102 is clamped by means of two clamping rings 106 and 108 in a seal holding ring 110 which is screwed to the upper flange plate 100 and which has a channel 112 on the inside for supplying the seal 102 with pressure medium.
  • the seal 102 is acted upon by a pressure medium via the channel 112 to seal the lower lock gate 42, 44, so that the seal rests firmly on the inner surface of the sealing cap 46. If the lower lock gate 42 is to be opened, the pressurization of the seal 102 is set in order to reduce the friction with the sealing cap 46 and thus to increase the service life of the seal 102.
  • the bulk material scraper 104 is designed as a ring, the outer diameter of which is somewhat smaller than the inner diameter of the seal retaining ring 110 and the lower end face 114 of which is conically tapered in such a way that it lies against the sealing cap 46.
  • a pressure ring 116 arranged above the bulk material scraper 100, the bulk material scraper is pressed against the inner surface of the sealing cap 46 with a certain force.
  • the arrival Press ring 1 16 can have at its upper end a radially outwardly extending projection 118 which is designed as a plate spring and which is provided on its outer edge with a circumferential, axially widened clamping nose 120.
  • the pressure ring 116 can be clamped between the flange plate 100 and the seal retaining ring 110 and screwed to it, the pressure ring 116 being arranged radially inside the seal retaining ring 110 and with radial play occurring between the pressure ring 116 and the seal retaining ring 110 . Due to the larger axial dimensions of the clamping lug 120, a gap is formed between the plate spring 118 and the flange plate 100 and between the plate spring 118 and the seal retaining ring 110. The pressure ring 116 is thus resiliently mounted within the seal holding ring 110 and can experience a certain deflection vertically.
  • An elastomer ring 122 is clamped between the flange plate 100 and the pressure ring 116 and thereby fulfills the function of closing the gap formed between the flange plate 100 and the plate spring 118 against the ingress of bulk material.
  • Both the underside of the flange plate 100 and the upper end face of the pressure ring 116 preferably each have a circumferential groove with a semicircular cross section, which lie axially opposite one another and in which the elastomer ring 122 is arranged.
  • the spring-loaded pressure ring 116 is preloaded by the cap 46 in such a way that the necessary contact pressure is created between the bulk material wiper 104 and the cap surface.
  • a lower lock gate 42 with such a sealing seat 49 ensures a high level of security against sudden pressure loss. Since the gap between the clamping rings 106, 108, with which the inflatable seal 102 is fastened to the seal holding ring 110, and the inner surface of the sealing cap 46 is very small, only a little gas can escape through this gap. Thus, even if the inflatable seal 102 is destroyed or if its pressure medium supply fails, there is no sudden drop in pressure in the lock bunker 24. Since the concave curvature of the sealing cap 46 also faces the lock bunker 24 and thus the axis of rotation 54 lies above the sealing cap 46, this can be the case Do not open the lock gate automatically even if all media supplies fail, since the sealing cap 46 is held in its closed position by gravity.
  • the pressure ring comprises two partial rings 116 'and 116 "arranged one above the other, which are screwed together and between which a spring washer 124 is clamped.
  • the upper partial ring 116' has the circumferential one Groove with a semicircular cross-section, in which the elastomer ring 122 is arranged.
  • the outer diameter of the spring washer 124 is significantly larger than the outer diameter of the two part rings 116 'and 116 ", so that the spring washer 124 radially outward between the two partial rings 116' and By means of the outstanding outer area, the spring washer 124 is clamped between the flange plate 100 and the seal retaining ring 110, so that in this embodiment too, a springy suspension of the pressure ring is achieved.
  • the spring washer 124 can also be replaced by radially arranged leaf springs .
  • FIG 11 shows a bulk material flap 126 for an alternative embodiment of the upper lock gate 40.
  • the bulk material flow through the outlet shaft 36 can also be prevented by a bulk material flap 126 which transports the bulk material conveyor 12 transversely to the transport direction encloses at the level of the outlet shaft 36 and can close it.
  • the bulk goods flap 126 advantageously comprises two angled rotating arms 128 and 130, each of which is rotatably supported above the conveyor 12 by a first end on an axis 132 running in the transport direction.
  • the rotating arms 128 and 130 are arranged against one another in such a way that when the bulk material flap 126 is closed, the respective first legs 134 and 136 of the rotating arms 128 and 130 extend essentially horizontally in opposite directions and that the respective second legs 138 and 140 extend substantially vertically downward, with the rotating arms 128, 130 embracing the bulk material conveyor 12 and the lower ends of the protrude second leg 138 and 140 below the shortened outlet shaft 36.
  • a cylindrical striking plate 140, 142 is attached to each of these lower ends of the second legs 138 and 140, respectively.
  • these striking plates 140 and 142 collide in the middle below the chute 36 and close the latter for the bulk material.
  • overlapping striking plates 140 and 142 can also advantageously be used. These overlapping striking plates 140 and 142 then have corresponding cutouts which cooperate when the striking plates 140 and 142 are moved apart to uncover an opening centered on the axis of the opening 28, 30 below it.
  • the striking plates 140, 142 are pivoted sideways on their rotating arms 128 and 130, the rotation taking place about the axis 132.
  • a hydraulic cylinder 146 is attached to the axis 132, on the pistons of which two tie rods 148 are rotatably mounted with their upper end.
  • the lower ends of the two tie rods 148 are rotatably mounted on the pivot arms 128 and 130, the points of attack being in the region of the kink of the corresponding pivot arm 128 and 130, respectively.
  • FIG. 12 shows, analogously to FIG. 8, the functioning of a bulk material lock with bulk material flap 126, the bulk material flap being shown rotated by 90 °. It can be seen in the lower partial images that no closure plate 90 but only a wiper 94 is fastened on the rotating arm 68. However, the mode of operation of the bulk goods lock is basically the same as that of the bulk goods lock from FIG. 8. While the lock bunker 28 is being emptied and is therefore closed by the upper lock gate 40, the lock bunker 24 is filled with bulk goods ( Figure a). For this purpose, the bulk material flap 126 is opened, so that the bulk material conveyor 12 brought bulk material 96 through the shortened chute 36 into the mouth 28 of the lock bunker 24 can fall.
  • the bulk material flap 126 closes in order to interrupt the flow of bulk material through the chute 36.
  • the chute fills with bulk material and newly brought bulk material is conveyed to the lock bunker 26, which has now been pressurized and released.
  • the sealing disk 66 is pivoted to the lock bunker 24 and lowered sealingly on its mouth 28. After pressure equalization with the surroundings, the lower lock gate 42 is opened and the bunker empties (Fig. B). After emptying, the lower lock gate 42 is closed again and the lock bunker 24 is pressurized.
  • the sealing disk 66 is brought into an intermediate position, which clears both openings 28 and 30 (picture c below). Then the bulk material flap 126 is opened and the bulk material that had previously accumulated in the chute 36 falls into the lock bunker 24 and the chute 36 is released again. The bulk material 96 brought in can now fall back into the lock bunker 24. Since the sealing washer 66 is in its intermediate position, bulk material which was conveyed over the chute 36 before it opened, but has not yet reached the lock bunker 30, can continue to fall through the chute 38 into the lock bunker 26. Only after this has taken place, the sealing disk 66 pivots further and seals the junction 30, whereupon a new lock cycle begins. FIG.
  • FIG. 13 shows a further embodiment of the device according to the invention.
  • This is a configuration with a single lock bunker 24.
  • a connection piece 150 leads out of the pressure container 2, which is designed as a chute and has a flange 152 at its lower end.
  • the lock arrangement is mounted on this flange.
  • This lock arrangement comprises a tubular lock pre-chamber 154 which is open at both ends, the lower opening being somewhat larger than the upper opening, so that the lock pre-chamber 154 widens conically downwards.
  • This conical shape prevents a bulk material column in the lock pre-chamber 154 from blocking it and preventing the bulk material from falling out into the lock bunker 24 when the lock gate 40 is open.
  • a pressure housing 156 with an essentially circular horizontal cross section is mounted at the lower end of the lock antechamber 154.
  • a lock bunker 24 is arranged below the pressure housing 156 in the axial extension of the lock pre-chamber 154.
  • An upper lock gate 40 of the type described above with a sealing disk 66 and a closure plate 90 is accommodated in the pressure housing 156.
  • the plate 76 ' which is circular, corresponds to the plate 22, 76 from FIG. 5.
  • the (shortened) axis of rotation 70 is arranged, which here is also passed gas-tight through a bushing 78 and on it lower end (as in FIG. 3) is driven by a drive motor 80 via a gear 82.
  • the pressure housing 156 has reinforcing struts 158 which prevent the housing walls from bulging out due to the excess pressure prevailing in the pressure housing 156.
  • the lock bunker 24 can be filled with bulk material.
  • the bulk material brought in by the bulk material conveyor 12 falls through the lock pre-chamber 154 and through the pressure housing 156 into the lock bunker 24.
  • the upper lock gate 40 swivels into its closed position, in which the lower discharge opening of the lock pre-chamber 154 through the closure plate 90 for the bulk material is closed and the opening of the lock bunker in the plate 76 'is sealed by the sealing washer 66.
  • a pressure equalization with the surroundings is then established in the lock bunker 24 before the lower lock gate 42 is opened and the lock bunker 24 empties.
  • the lower lock gate 42 closes again and a pressure equalization the pressure vessel is manufactured in the lock bunker 24.
  • the bulk material conveyed by the bulk material conveyor 12 collects above the closure plate 90 in the lock pre-chamber 154.
  • the sealing disk 66 is then raised by means of the hydraulic cylinder 84 and pivoted away under the opening.
  • the bulk material collected in the lock pre-chamber 154 falls into the lock bunker 24 and in turn clears the passage so that a new cycle can begin.
  • the rotating arm 68 is pivoted through 360 °, so that a scraper can clean the flat plate of bulk material parts before the sealing disk is pressed against the plate.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Organic Chemistry (AREA)
  • Filling Or Emptying Of Bunkers, Hoppers, And Tanks (AREA)
  • Auxiliary Methods And Devices For Loading And Unloading (AREA)

Abstract

L'invention concerne un dispositif pour retirer une matière en vrac (96) contenue dans un récipient sous pression (2), ledit dispositif comprenant au moins un réservoir de type écluse (24, 26) comprenant une porte d'écluse inférieure (42, 44) et supérieure (40). Le réservoir (24, 26) est situé sous une plaque (76, 76') dans laquelle il forme une unité de décharge (28, 30) pour la matière en vrac (96). La porte d'écluse supérieure (40) présente un disque étanche (66) placé au-dessus de la plaque (76 76') de sorte qu'il peut être positionné au-dessus de l'unité de décharge (28, 30) du réservoir (24, 26) et, après avoir été raccordé de façon étanche à la bordure de l'unité de décharge (28, 30), peut être comprimé contre cette bordure par une surpression dans le réservoir sous pression (2)
PCT/EP1996/003311 1995-08-25 1996-07-26 Dispositif pour retirer une matiere en vrac contenue dans un recipient sous pression WO1997007880A1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
BR9610019A BR9610019A (pt) 1995-08-25 1996-07-26 Dispositivo para descarregar material a granel de um reservatório pressurizado
EP96928384A EP0861118A1 (fr) 1995-08-25 1996-07-26 Dispositif pour retirer une matiere en vrac contenue dans un recipient sous pression
AU67876/96A AU701189B2 (en) 1995-08-25 1996-07-26 Device for discharge of bulk material from a pressure vessel

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
LU88648 1995-08-25
LU88648A LU88648A1 (de) 1995-08-25 1995-08-25 Vorrichtung zum Austragen von Schuettgut aus einem Druckbehaelter

Related Child Applications (1)

Application Number Title Priority Date Filing Date
US09/006,818 Continuation US6010041A (en) 1995-08-25 1998-01-14 Device for discharge of bulk material from a pressure vessel

Publications (1)

Publication Number Publication Date
WO1997007880A1 true WO1997007880A1 (fr) 1997-03-06

Family

ID=19731545

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP1996/003311 WO1997007880A1 (fr) 1995-08-25 1996-07-26 Dispositif pour retirer une matiere en vrac contenue dans un recipient sous pression

Country Status (8)

Country Link
US (1) US6010041A (fr)
EP (1) EP0861118A1 (fr)
AU (1) AU701189B2 (fr)
BR (1) BR9610019A (fr)
CA (1) CA2227227A1 (fr)
LU (1) LU88648A1 (fr)
WO (1) WO1997007880A1 (fr)
ZA (1) ZA966649B (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6010041A (en) * 1995-08-25 2000-01-04 Paul Wurth, S.A. Device for discharge of bulk material from a pressure vessel
WO2000024495A1 (fr) * 1998-10-27 2000-05-04 Outokumpu Oyj Appareil permettant d'evacuer des matieres d'un espace sous pression
US8883424B2 (en) 1999-05-21 2014-11-11 Illumina, Inc. Use of microfluidic systems in the detection of target analytes using microsphere arrays

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6450679B1 (en) * 2000-10-23 2002-09-17 Guntert & Zimmerman Const. Div., Inc. Large volume twin shaft compulsory mixer
US20060144866A1 (en) * 2003-06-25 2006-07-06 Serby-Tech Ltd. Gating system for flowable material and conveying apparatus including same
EP3265271B1 (fr) * 2015-03-06 2019-09-11 Cold Jet LLC Appareil d'apport de particules
DE102015218380A1 (de) 2015-09-24 2017-03-30 Gebr. Willach Gmbh Beladevorrichtung für eine Warenübergabevorrichtung eines automatischen Warenlagers

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GB178907A (en) * 1921-01-20 1922-04-20 Edward William Woolgar Improvements in or relating to elevators and/or conveyors
US2655265A (en) * 1949-01-31 1953-10-13 Goslin Birmingham Mfg Company Continuous rotary pressure or vacuum filter
DE2556303A1 (de) * 1975-12-13 1977-06-23 Heinz Hoelter Pneumatischer kammerdruckfoerderer
US4089429A (en) * 1977-05-09 1978-05-16 Stock Equipment Company Apparatus for introducing particulate material into a vessel
WO1982000992A1 (fr) * 1980-09-24 1982-04-01 Snowdon B Transport de materiaux en vrac
US5362393A (en) * 1992-02-10 1994-11-08 Karl Brieden Bau-Und Beteiligungs-Kg Pressure filter for liquids

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GB128907A (en) * 1918-06-28 1920-08-26 Pratt & Whitney Co Improvements in and relating to Grinding Gauge-pieces and the like.
US3224606A (en) * 1962-05-10 1965-12-21 Lummus Co Pressure sealing valve
US4957221A (en) * 1989-01-03 1990-09-18 Cmi Corporation Air tight storage silo
US5244019A (en) * 1989-09-15 1993-09-14 Better Agricultural Goals Corp. Vacuum fill system
GB9407797D0 (en) * 1994-04-20 1994-06-15 Ishida Europ North Limited Dispensing machine
LU88648A1 (de) * 1995-08-25 1997-02-25 Wurth Paul Sa Vorrichtung zum Austragen von Schuettgut aus einem Druckbehaelter

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB178907A (en) * 1921-01-20 1922-04-20 Edward William Woolgar Improvements in or relating to elevators and/or conveyors
US2655265A (en) * 1949-01-31 1953-10-13 Goslin Birmingham Mfg Company Continuous rotary pressure or vacuum filter
DE2556303A1 (de) * 1975-12-13 1977-06-23 Heinz Hoelter Pneumatischer kammerdruckfoerderer
US4089429A (en) * 1977-05-09 1978-05-16 Stock Equipment Company Apparatus for introducing particulate material into a vessel
WO1982000992A1 (fr) * 1980-09-24 1982-04-01 Snowdon B Transport de materiaux en vrac
US5362393A (en) * 1992-02-10 1994-11-08 Karl Brieden Bau-Und Beteiligungs-Kg Pressure filter for liquids

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6010041A (en) * 1995-08-25 2000-01-04 Paul Wurth, S.A. Device for discharge of bulk material from a pressure vessel
WO2000024495A1 (fr) * 1998-10-27 2000-05-04 Outokumpu Oyj Appareil permettant d'evacuer des matieres d'un espace sous pression
US6521121B1 (en) 1998-10-27 2003-02-18 Outokumpu Oyj Apparatus for removing material from pressurised space
US8883424B2 (en) 1999-05-21 2014-11-11 Illumina, Inc. Use of microfluidic systems in the detection of target analytes using microsphere arrays
US9289766B2 (en) 1999-05-21 2016-03-22 Illumina, Inc. Use of microfluidic systems in the detection of target analytes using microsphere arrays

Also Published As

Publication number Publication date
CA2227227A1 (fr) 1997-03-06
US6010041A (en) 2000-01-04
ZA966649B (en) 1997-02-18
BR9610019A (pt) 1999-07-06
LU88648A1 (de) 1997-02-25
AU6787696A (en) 1997-03-19
EP0861118A1 (fr) 1998-09-02
AU701189B2 (en) 1999-01-21

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